The pressure in a vessel that contained pure oxygen dropped from 1000mm to 750mm in47 minutes as the oxygen is leaked through a small hole.when the same vessel was filled with another gas the pressure dropped from 1000mm to 750 in 74 minutes.What is the molecular weight of the second gas?

'x' gm of a compound A3B2C5 contains 'y' gm of A atoms

 

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how to represent the possible fischer projections for 2-bromohexane